Improved balance slide-valve



PATENT OFFICE.

ANTOINE STEBER, OF UTIOA, NEW YORK.

IMPROVED BALANCE SLIDE-VALVE.

Specification forming part of Letters Patent No. 93, l 33, dated July 27, 1869.

To all whom it may concern:

Be it known that I, ANTOINE STEBER, of the city of Utica, in the State of New York, have invented a new and useful Balance Slide- Valve for Steam-Engines; and I do hereby declare that the following is a full and exact description of the construction and operation thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The object of my invention is to relieve the` valve from the effect of the pressure of steam up it and effect an easy movement of the same, and I do this by providing a box to stand A within the steam-chest in front of the cylinder,

being constantly supplied with steam from the surrounding steamchest, in the manner hereinafter described.

To further illustrate this arrangement, I refer to the annexed drawings.

Figure 1 is a cross-section of the apparatus referred to. A is an end View of a fragment of the cylinder, and the remainder of the tigure shows the valve arrangement attached thereto. B is the steam-chest, into which the steam enters from the boiler through the nozzle O. D is the inclosin g box, into which 'the movable valve-box, with duplicate valves,

is inserted, and within which it moves. It,

Fig. 3, is a cross-section of this valve-box,

which is iitted to move Within the cavity D. (Shown in Fig. 1.) The sidesN and O of this box each constitute a slide-valve, moving upon the opposite plane, G and H, Fig. 1, opening and closing simultaneously the perpendicular aperturesi and la for the passage of the steam to and from the cylinder, inthe usual manner, the steam-chest B always supplying the interior of the valve-box with full pressure of steam through .the longitudinal orifices l and m, Figs. 1 and 3, which are never closed, while the perpendicular ports (represented by the spaces i and k, Fig. 1) are alternately opened and closed by the movements ot' the valves in the usual manner, the apertures for escape ot' the steam on each side of the valve-box being alike opened and closed at the same time, the steam passing to the cylinder by the circuitous passages P P on each side of the box, as indicated by the arrows. The movement is the same as that of the slide-valves in common use, except that the valves and passages are here duplicated. Thus the pressure of the valve upon the face of the cylinder is neutralized and wholly removed. A perfect contact ot` the face of the valves and the face abraded by it is maintained by reason of the valve-box It, Fig. 3, and the corresponding cavity D, Fig. 1, in which it moves, being wedge-shaped, or narrower at the bottom than at the top, as shown in the drawings. The weight of the valves secures a constant contact, and its motion under slight but constant pressure makes a perfect tit. For the purpose of self-adjustment of the valves when in operation, the base S, Fig. 4, of the valve-rod t is attached to the end plate of the valve-box u by a loose dovetailed plate let into the end plate and capable of self-adjustment in a vertical direction when in action; and also, to promote a closing valve-box D, Fig. 1, showing at F the usual arrangement of the steam-ports operated upon by the movement ot' the valves. rllhis arrangement (yles not differ from that in common use, excepthat what is here shown is duplicated, as before described, and is the same on both sides of the valve-box.

Fig. 4 is a longitudinal side View of the movable valvebox, showing one of the two equal opposite sides with the valve arrange- A ment. This face arrangement, as seen from W to X, is similar to the face of the ordinary slide-valve, the -opposite sides of the box being precisely similar to that here seen. In addition to this ordinary valve arrangement, the figure shows the aperture Y. This is the inlet for the steam from the steam-chest to the interior of the valve-box, and is alike on both sides ot' the box. These apertures are never closed, while the apertures e and d are elter- K,seat D, and steam-chest B, constructed and nately opened and closed by the movement of arranged with reference to each other subthe valve in the usual way. stantially as described.

Having thus described my invention, what I ANTOINE STEBER. claim as new, and desire to secure by Letters Witnesses: Patent, is- WILLIAM BAKER,

The hollow slide-valve R, with ports I m i DEXTER GILLMORE. 

